Billet-heating furnace



May 29, 1923.

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` 1 'Y N. F. `-EGLER BILLET HEATING FURNACE Filed Apr 6 sheets-sheet 2- Il.' lll lll' LI il 2l -1921 N. F. l-:GLER

BILLET HEATING FURNACE Filed Apri1 21, 1921 e Sheets-:sheet 4 Jn've'fzfr MVO? May 29, 1923. k1,456,788-

N F. EGLER y BILLET HEATING FURNACE Filed April 2l 1921 6 Sheets-Sheet 5 Ma-yzs, 1923. v*1,456,738 i A N. FfEGlER BILLET HEATING FURNACE .Filed April .2i 192i s sheetsgsheet e Patented May .'29, 1923.

UNITED STATES 4Param GFF-ICEX NICOLAS r. EGLER, or CHICAGO, ILLINOIS, AssIGNoR, BY MEsNE AssIGNMEitTs,tTof

THE UNION TRUST COMPANY, TRUSTEE, vOF CLEVELAND, OHIO.

BILLET-HEATNG FURNACE.

To all whom it may coaoem:

Be it known that I, Nicolas F` EGLER, a

citizen of the United States, residing at Blair En ineering Company, 343 S. Dearborn St., hica o, in the county of Cook and State of Illinois., have invented a new and useful Improvement in Billet-Heating Furnaces, of which the following is a specification. 10, This invention relates to furnacesof the recuperative type for heating billets and the like and is fully described in the following s ecification and shown in the accompanying rawings, in which:

Figure 1 is a vertical section on the line 1 of Fig. 3, through the end of the furnace to which the billets are fed;

Fig. 2 is a continuation of Fig. 1 on the line 2- of F i 4, showing the opposite or hearth end of t e furnace;

Figs. 3 and 4 are horizontal sections on the line 3-3 of Figs. 1 and 4 4 of Fig. 2 respectively;

Fig. 5 is a vertical section on the line 5-5 of Fig. 3, and K Fig. 6 is a vertical section on the line 6-6 of Fig. 2.

The invention is embodied in a furnace of the continuous heating type consisting of a lon horizontal heating passage 10 to which gas 1s fed through the gas main 11 and mixed v with air from the air passages 12 in the mixing passages 13 where it is ignited. The flame spreads over the hearth 14 and part way down the passage 10the burned gases passing outthe flue 15 to a'stack (not shown).

Parallel skids, of which two are shown, consisting of water cooled pipes 16, run the entire length of the furnace and are sharp- '1 inclined at 16a at the front end. These s ids are supported on columns 17 as shown in Fi 5. The billets 18"to bev heated areconnects at one end with' the passages 12 and at the other through the heater tubes 27 and the rct'urn bends 27 b with the cold air manifold 28. This pipe is connected to a blower or the like `(not shown). The recuperator tubes 27A are roundat the ends and are rotat-y ably mounted in theside walls of the furnace as shown in Fig. 3. The central 'portions 27a are preferably flattened and lie across the furnace chamber near its top and above the 'space through which the billets 18 pass.

The method of operation is as follows Billets are brought up to the rear door of the furnace on the skids 29 as shown in Fig. 1, the door 19 is opened and the billets forced one at a time through the rear opening: The

door is then closed. At the same time, com-- bustible gas is fed into the furnace through the passage 11 and air through the passage 12, the amount of air being regulated by means of the valves 22. The flame extends above and below the billets, the hottest part of the flame coming into contact with the. .hottest billets.

Bythe time the hot gases have reached the recuperator tubes 27, 'the flames have about ceased and the cold billets and the pipes 27 filled with cold air rapidly cool the ases so that they have lost a large part of t eir sensible heat by the time they reach the flue 15. If desired, the tubes 27 may be turned in their bearings to deflect the hot gas down upon the billets.

This construction permits the furnace to be' built almost entirely above ground and completely does away with the brick work so i commonly used in such furnaces which is so expensive to install and to keep in repair. B placing steel tubes at or near the point wiiere the flame stops, the life of the metal tubes is greatly increased.- This is largely due to the fact that sulphur isf/often present in'the'gas and when the recuperator tubes are placed. at too cool a. point, rapid deterioration of the tubes takes place. because of the acid character of the gas.

While I have shown. and described but a single embodiment of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing fr o`m the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelfy inherent in my invention as broadly as ossible in View of the prior art.

lVhat l vc aim as new and desire tosecure by Letters Patent is:

1. A recuperative furnace comprising an elongated combustion chamber and pipes lying across said chamber through which air passes for preheating said air for the furnace.

2. A recuperative furnace comprising an elongated combustion chamber and pipes lying across the lupper part of said chamber through which air passes for preheating said air for the furnace. y

3. A recuperative furnace comprising an elongated combustion chamber and pipes lying across said chanher for prehcating air for said furnace, said pipes` having flat portions lyirff within the chamber and round ends mountet in the furnace walls, whereby they may be turned to any desired angle.

4. A. recuperative furnace comprising an elongated combustion chamber and pipes lying across said chamber for preheating air for said furnace, said pipes having flat portionslying within the chamber and ends journalled in the furnace walls, whereby they may be turned to any desired angle.

5. A recuperatiye furnace comprising` an elongated combustion chamber and pipes lying across said chamber for carrying air, said pipes being located near a point where the flame ceases for preheating said air for the furnace.

6. In a recuperating furnace, an elongated combustion chamber, air pipes lying across said chamber near the out end of the furnace, and headers connecting the ends of said pipes, one of said headers leading to the in end of the'furnace whereby the air is preheated.

7. In a recuperative furnace, an elongated combustion chamber,` air pipes lying across said chamber near the out end of the furnace, and headers connecting the ends of said pipes,rsaid pipes having flattened portions and vbeing mounted to rotate about a longitudinal axis, one of said headers leading to the in end of the furnace whereby the air is preheated.

NICOLAS F. EGLER. 

